"During cruise, oil quantity displays on EICAS whenever oil quantity on one
engine differs from any other engine by a predetermined amount. When this
occurs, the lowest oil quantity is shown in magenta. If there is an increase in oil
quantity during cruise (indicator malfunction or leaking fuel/oil heat exchanger),
the EICAS oil partial engine indications display may appear. However, for this
condition the low quantity displays in magenta, even though that oil quantity may
be normal."
I thought the quantity difference was 5 quarts, but they have removed the number from the FHB. Perhaps a customer specific option?